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Enzymologists usually study the initial rates of reactions measuring product formation as a function of substrate concentration or other variable. Cell biologists are more likely to want to know the effect of a change on the steady state behavior of a complex system.

EPA has a long history of relying on science that was not created by the agency itself. This often means that the science is not available to the public and, therefore, cannot be reproduced and verified.

Epidemics historically have tended to kill the very young and the very old, but AIDS is different: Those ages 20 to 40 are most affected, which means that so far over 12 million African children have been orphaned because of AIDS.

Epidemiologists study patterns in order to combat infection. Stories about epidemics follow patterns, too. Stories aren't often deadly, but they can be virulent: spreading fast, weakening resistance, wreaking havoc.

Epigenetics doesn't change the genetic code, it changes how that's read. Perfectly normal genes can result in cancer or death. Vice-versa, in the right environment, mutant genes won't be expressed. Genes are equivalent to blueprints; epigenetics is the contractor. They change the assembly, the structure.